In accordance with certain aspects of the present invention, enhancements have been developed to further extend the performance of the generic DVD navigator with respect to restricted access, such as parental controlled access. The methods and arrangements provided herein support various decision mechanisms associated with conventional dual branching operations and coordinating the handling of parental level requests. The methods and arrangements also support a plurality of parental levels and multi-segment parental level branching schemes.

 
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> In a data storage server, for each subsets which does not contain compressed data after the compression, a predetermined value is stored in the corresponding entry of the corresponding compression group to indicate that corresponding data is compressed

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